# Prince G engine

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The **Prince G-series** engine was the company's only straight-four and straight-six engines which began production in 1955. A number of variations were made, with both OHV and OHC heads. A diesel four-cylinder with 1.9 L (1,862 cc) was also built, called the **D-6**. The G series was used in the Skyline, the Laurel, and the Gloria from the 1950s to the early 1970s.

Prince G engine | |
---|---|

Overview | |

Manufacturer | Prince Motor Company |

Production | 1955-1975 |

Layout | |

Configuration | Inline 4 & Inline 6 |

Displacement | Four-cylinder: 1.5 L (1,484 cc) 1.6 L (1,593 cc) 1.8 L (1,815 cc) 1.9 L (1,862 cc) 2.0 L (1,990 cc) Six-cylinder: 2.0 L (1,988 cc) 2.5 L (2,494 cc) |

Cylinder bore | 75 mm (2.95 in) 80 mm (3.15 in) 82 mm (3.23 in) 84 mm (3.31 in) 89 mm (3.5 in) |

Piston stroke | 63 mm (2.48 in) 70.2 mm (2.76 in) 80 mm (3.15 in) 84 mm (3.31 in) 85 mm (3.35 in) |

Valvetrain | OHV (GA30, GA4, GB30) SOHC (all except GR-8, GA30, GA4, GB30) DOHC (GR-8) |

Compression ratio | 8.3:1, 9.3:1, 9.7:1, 11.0:1 |

Combustion | |

Fuel system | SU or Weber carburetors Mechanical fuel injection |

Fuel type | Gasoline, Diesel |

Cooling system | Water cooled |

Output | |

Power output | 46–223 PS (34–164 kW; 45–220 bhp) |

Torque output | 10–19.9 kg⋅m (98–195 N⋅m; 72–144 lb⋅ft) |

Chronology | |

Predecessor | FG4A |

Successor | L16 (G-16) L18 (G-18) L26 (G-20) S20 (GR-8) |

Note that, prior to its merger with Prince, Nissan also made a G series of engines. These are unrelated engines and are documented at the Nissan G engine page.

The source of the listed information is the corresponding article at Japanese Wikipedia.

## Straight-4Edit

### FG4A-10Edit

1.5 L (1,484 cc) diameter X stroke: 75 mm × 84 mm (2.95 in × 3.31 in), OHV

- Maximum output (gross) 46 PS (34 kW; 45 bhp) @ 4000 rpm
- Maximum torque (gross) 10 kg⋅m (98 N⋅m; 72 lb⋅ft) @ 2000 rpm
- 1952-1955 Prince Sedan AISH
- 1952-? Prince Truck AFTF

### FG4A-20Edit

1.5 L (1,484 cc) diameter X stroke: 75 mm × 84 mm (2.95 in × 3.31 in), OHV

- Maximum output (gross) 53 PS (39 kW; 52 bhp) @ 4000 rpm
- Maximum torque (gross) 10.4 kg⋅m (102 N⋅m; 75 lb⋅ft) @ 2000 rpm
- 1955-1957 Prince Sedan AISH

### FG4A-30Edit

1.5 L (1,484 cc) diameter X stroke: 75 mm × 84 mm (2.95 in × 3.31 in), OHV

- Maximum output (gross) 61 PS (45 kW; 60 bhp) @ 4000 rpm
- Maximum torque (gross) 10.75 kg⋅m (105 N⋅m; 78 lb⋅ft) @ 2000 rpm

Renamed GA-30 in 1957

Applications:

- 1957 Prince Sedan AISH-6

### GA-30Edit

1.5 L (1,484 cc) diameter X stroke: 75 mm × 84 mm (2.95 in × 3.31 in), OHV

- Maximum output (gross) 61 PS (45 kW; 60 bhp) @ 4400 rpm
- Maximum torque (gross) 10.75 kg⋅m (105 N⋅m; 78 lb⋅ft) @ 3200 rpm
- 1957 Prince Skyline ALSI-1
- 1957-1961 Prince Skyline ALSI-2
- 1957-? Prince Truck ALPE
- 1958-1959 Prince Miler ARTH-1

### GA-4Edit

1.5 L (1,484 cc) diameter X stroke: 75 mm × 84 mm (2.95 in × 3.31 in), OHV

- Maximum output (gross) 71 PS (52 kW; 70 bhp) @ 4000 rpm
- Maximum torque (gross) 11.5 kg⋅m (113 N⋅m; 83 lb⋅ft) @ 2000 rpm

1959 improvement on the GA-30; also known as FG4A-40

- Mechanical similarities with engine used in Subaru 1500

Applications:

- 1957-1959 Prince Skyway ALVG
- 1959-1963 Prince Miler ARTH-2
- 1957-? Prince Miler Van ARVF
- 1958-1961 Prince Skyline ALSI-2
- 1959-1961 Prince Skyway
- 1962-1964 Prince Light Miler T430

### GB-30Edit

1.9 L (1,862 cc) diameter X stroke: 84 mm × 84 mm (3.31 in × 3.31 in), OHV

- Maximum output (gross) 81 PS (60 kW; 80 hp) @ 4800 rpm
- Maximum torque (gross) 14.9 kg⋅m (146 N⋅m; 108 lb⋅ft) @ 3600 rpm

Also known as FG4B-30

Applications:

- 1957-1961 Prince Miler Van BRVF
- 1959-1960 Prince Gloria BLSIP-1
- 1960-1961 Prince Gloria BLSIP-2

### GB-4Edit

1.9 L (1,862 cc) diameter X stroke: 84 mm × 84 mm (3.31 in × 3.31 in), OHV

- Maximum output (gross) 95 PS (70 kW; 94 bhp) @ 4800 rpm
- Maximum torque (gross) 15.6 kg⋅m (153 N⋅m; 113 lb⋅ft) @ 3600 rpm

Also known as FG4B-40

Applications:

- 1961-1963 Prince Gloria BLSIP-3
- 1961-1963 Prince Skyline BLSI-3
- 1961-1963 Prince Miler BRTH-2
- 1961 Prince Skyline Sport BLRA-3 Coupe & Convertible
- 1962 Prince Skyline S21
- 1963-1964 Prince Super Miler T431
- 1963 Prince Sprint concept

### G-1Edit

The Prince **G-1** was the improved GA-4, and was rated at 1.5 L, but displaced 1.5 L; 90.6 cu in (1,484 cc) thanks to an entirely different 75 by 84 mm (2.95 by 3.31 in) bore and stroke. This undersquare arrangement was similar to the designs Nissan licensed from Austin Motor Company, though this is probably coincidental. This engine was also an OHV design and power output was similar to the Nissan G at 73 hp (54 kW; 74 PS) and 12 kg⋅m (118 N⋅m; 87 lb⋅ft).

Applications:

- 1958-1963 Prince Clipper AQTI
- 1961-1968 Prince Homer T64/T640
- 1963-1965 Prince Clipper T630
- 1963-1967 Prince Skyline S50
- 1963-1968 Prince Skyway V51 (renamed as "Nissan Prince Skyline Van" in 1966 after the merger with Nissan)
- 1965-1966 Prince Light Miler T440

### G-2Edit

The **G-2** is a 1.9 L; 113.6 cu in (1,862 cc) version used by Prince. Bore and stroke were square at 84 mm (3.31 in), and output was 96 hp (72 kW; 97 PS) and 15.7 kg⋅m (154 N⋅m; 114 lb⋅ft) with a 2 barrel carburetor. It was an improved version of the GB-4 and was introduced in 1962 and was installed in the S40 Prince Gloria. The G-2 was an OHV design.

Applications:

- 1962-1965 Prince Gloria S40
- 1963-1967 Prince Clipper T631
- 1964-1967 Prince Super Miler T441

### G-15Edit

The SOHC **G-15** was a 1.5 L; 90.5 cu in (1,483 cc) engine produced in 1967 for the Skyline. Bore and stroke was 80 mm × 70.2 mm (3.15 in × 2.76 in). With a 2 barrel carburetor equipped, the engine produced 94 hp (70 kW; 95 PS) and 13.3 kg⋅m (130 N⋅m; 96 lb⋅ft). The Nissan G15 engine was not related to the Prince engine; the Nissan version was OHV and slightly smaller displacement.

Applications:

- 1967 Prince Skyline S57
- 1968-1972 Nissan Skyline 1500 (C10)

### G-16Edit

1.6 L (1,593 cc) inside diameter x stroke: 85 mm × 70.2 mm (3.35 in × 2.76 in) mmin, SOHC

- maximum output (gross) 100 PS (74 kW; 99 bhp) @ 6000 rpm
- Maximum torque (gross) 13.8 kg⋅m (135 N⋅m; 100 lb⋅ft) @ 4000 rpm

3 mm (0.12 in) bore increase of the G-15 engine, increased to a 1.6 L and used on the Skyline (C110). A major mechanical change in 1975 and was replaced by the Nissan L16 engine.

Applications:

- 1972-1975 Nissan Skyline 1600 (C110)

### G-18Edit

5-bearing, short-stroke, V-type valve arrangement, multi-ball-type combustion chamber, the G18 employs an aluminum cylinder head and engine-performance.

The **G-18** was a 1.8 L; 110.8 cu in (1,815 cc). Its 85 mm (3.35 in) bore was the largest in the range, and the 80 mm (3.15 in) stroke gave it good oversquare dimensions. It was an SOHC cross flow cylinder head design like the G-15 and produced 105 hp (78 kW; 106 PS) and 15.9 kg⋅m (156 N⋅m; 115 lb⋅ft).

This engine was discontinued in 1975 due to tightening emission regulations and replaced with the L18.

Applications:

- 1968-1972 Nissan Skyline 1800 (PC10)
- 1968-1972 Nissan Laurel C30
- 1972-1975 Nissan Skyline 1800 (PC110)
- 1972-1975 Nissan Laurel C130

### G-20Edit

2.0 L (1,990 cc) inside diameter x stroke: 89 mm × 80 mm (3.50 in × 3.15 in), SOHC

Twin Barrel single Carburetor

- compression ratio 8.3:1
- maximum output (gross) 110 PS (81 kW; 108 bhp) @ 5600 rpm
- maximum torque (gross) 16.5 kg⋅m (162 N⋅m; 119 lb⋅ft) @ 3200 rpm

Twin SU carburetor regular gasoline

- compression ratio 8.3:1
- maximum output (gross) 120 PS (88 kW; 118 bhp) @ 5800 rpm
- maximum torque (gross) 17 kg⋅m (167 N⋅m; 123 lb⋅ft) @ 3600 rpm

Twin SU carburetor high octane gasoline

- compression ratio 9.7:1
- maximum output (gross) 125 PS (92 kW; 123 bhp) @ 5800 rpm
- maximum torque (gross) 17.2 kg⋅m (169 N⋅m; 124 lb⋅ft) @ 3600 rpm

This engine was only used in the 1968-1975 C30 & C130 Laurel, and was discontinued in 1975 due to tightening emission regulations and replaced with the L26 engine.

## Straight-6Edit

Prince used a straight-6 version of the G family in their famous Skyline cars. All of the Prince straight-6 engines used single overhead cam heads.

### G-7Edit

The **G-7** is a straight-6 version displacing 2.0 L; 121.3 cu in (1,988 cc). It was the engine of the *GT*-model Prince Skylines and was an OHC engine unlike the mainly-OHV family that spawned it. Bore and stroke were square at 75 mm (2.95 in) and power output varied with the carburetor equipped. Plain versions featured a 2 barrel carb and 8.8:1 for 106 hp (79 kW; 107 PS) and 16 kg⋅m (157 N⋅m; 116 lb⋅ft), while the 1965 Skyline GT-B used 3 twin-barrel Weber carburetors and 9.3:1 compression for 127 hp (95 kW; 129 PS) and 17 kg⋅m (167 N⋅m; 123 lb⋅ft).

Applications:

- 1963-1967 Prince Gloria S41
- 1965-1968 Prince Skyline 2000 GT-A S54AE
- 1965-1968 Prince Skyline 2000 GT-B S54BE (3 Weber 40 DCOE carburetors)
- 1967-1969 Nissan (Prince) Gloria PA30

### G7B-REdit

2.0 L (1,988 cc) inside diameter x stroke: 75 mm × 75 mm (2.95 in × 2.95 in)

An improvement on the G7 using a cross-flow cylinder head and was converted into racing use during 1965 - 1966 in the S54 Skyline GT used for racing. Was not commercially available.

### GR-8Edit

2.0 L (1,996 cc) inside diameter x stroke: 82 mm × 63 mm (3.23 in × 2.48 in), DOHC

- compression ratio 11.0:1
- maximum output (gross) 197 PS (145 kW; 194 bhp) @ 8400 rpm
- maximum torque (gross) 17.5 kg⋅m (172 N⋅m; 127 lb⋅ft) @ 6400 rpm

Racing engine used in the Prince R380 and Nissan R380-II, based on the G7 engine. It used 4 valves per cylinders and DOHC, used 3 Weber carburetors model 42DCOE-18, producing a claimed 200 hp (149 kW; 203 PS) for the R380 and 220 hp (164 kW; 223 PS) for the R380-II. The GR-8 used in the R380-II featured mechanical fuel injection.

### G-11Edit

The **G-11** is another straight-6 OHC version, displacing 2.5 L; 152.2 cu in (2,494 cc). Bore was up to 84 mm (3.31 in) like the G-2 4-cylinder, while stroke remained at 75 mm (2.95 in) as on the G-7. Power output with a 4 barrel carburetor was 134 hp (100 kW; 136 PS) with 19.9 kg⋅m (195 N⋅m; 144 lb⋅ft) of torque.

Applications:

- 1964-1967 Prince Grand Gloria S44P